Upper Stomach Pain

Having stomach issues for the last 3 months. Waiting for ultrasound to be done this Friday. Labs normal. Lots of bloating, fullness, belching. I eat a few bites and get that “too full” hiccup associated with having a large meal and overeating. Mostly left back pain, but occasionally get middle to slight right back pain. My upper back seems very touchy right now. I’ve had more than a few back spasms in the area since this started. I assume that’s due to the inflammation from my stomach pushing on everything? Have had some sharp pains (especially at the top of my breath) right in the middle (at the bottom of my sternum). Has anyone had this experience with gastric issues/gastritis?